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例句 DEFINITIVE EXAMPLES 权威例句〔obturator〕An obturator is used to close a cleft palate.一个封闭器被用来封闭裂腭。剑桥高阶〔seal〕A substance, especially an adhesive agent such as wax or putty, used to close or secure something or to prevent seepage of moisture or air.封口之物:一种物质,尤指似蜡或油灰的粘性剂,用来封闭、保存某物或防止潮气或空气的渗流美国传统
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